Reuben c



R. c BAKER CORE EBELV April 14,1931.

Original Filed Dec.

N m a Reiasued Apr. 14, 1931 UNITED STATES PATENT OFFICE REUBEN C.BAKER, OF COALINGA, CALIFORNIA, ASSIGNOR' IO BAKER CASING SHOE COMPANY,OF HUNTINGTON PARK, CALIFORNIA, A CORPORATION OF CALIFORNIA CORE BARREL-Original No. 1,611,504, dated December 21, 1926, Serial No. 75,499,filed December 15, 1925. Application for reissue filed July 16, 1928.Serial No. 295,885.

This invention relates to oil well drilling equipment and particularlypertains to an apparatus for use in taking format1on samples or cores ofthe formation penetrated by the drill.

Prior to my invention it was usual practice in drilling a Well by thepercussion meth-' vention to provide an improved device adapted for usein connection with the percussion system of well drilling and which maybe efliciently employed to obtain accurate samples or cores of a well atfrequent in-- tervals.

-In carrying out this object into practice I have provided a hollowdrill barrel which may be run in the well at the end of the'drill stem.A hollow core barrel is reciprocably mounted within the lower end ofthe. drill barrel so that vertical reciprocation of the latter willdrive the core barrel over the core so that a sample of the formationbeing penetrated may be brought to the surface for examination. I alsomake use of the relative reci rocation of the parts to force cleansingfluid around the cutting ends of the tool to clean away the drillingsand cuttings so that a clean cut core will be obtained.

One form which the invention may assume is exemplified in the followingdescription and illustrated by way of example in the accompanyingdrawings, in which:

Fig. 1 is a view in vertical section through an apparatus-embodying thepreferred. form of the invention.

, Fig. 2 is a similar view of the device disclosing the manner of itsoperation.

Fig. 3 is a view of the lower end of the device.

Referring more particularly to the accompan 'ng drawings, 10 indicates adrill barrel ea having a threaded shank 11 at its upper end by means ofwhich the device may be connected with a drill stem. The lower end ofthe drill barrel head 10 is exteriorly threaded and is threadedlyconnected with the upper end of a cylindrical drill barrel 12. The lowerend of this drill barrel 12 is fitted with a drilling shoe 14 which iscapable upon vertical reciprocation of the device to drill through thestrata encountered in drilling an oil well. The interior diameter of theshoe 14 is less than that of the barrel 12 so as to form an interiorlyprojecting annular shoulder 15 within the barrel 12 and adjacent itslower end.

Reciprocably mounted within the bore of the drill barrel 12 is acylindrical core barrel 16 which is fitted at its lower end with a shoe17 having a sharpened lower end. The exterior diameter of the corebarrel 16 and its shoe 17 is somewhat less than the interior diameter ofthe drilling shoe 14 and similarly. the drill barrel 12. This forms anannular passageway between the adjacent surfaces of theatwo barrels.

At it upper end the core barrel 16 is fitted with a head member 18 whichis larger in diameter than the barrel 16thereby forming an exteriorlyprojecting annular shoulder 19 Th s shoplder 19 is adapted to abut.against shoulder 15 when the core barrel is in its lowermost positionand thereby prevent re moval of the core barrel from the drill barrelwithout removing the shoe 14 from the latter.

The exterior surface of the corebarrel head member 18 is formed with aplurality of longitudinal grooves 20 to permit liquid with a pluralityof vertical passageways through which the fluid passing downwardlythrough the pass-age between the barrels may discharge between thecutting edgesof the shoes.

It will also be noticed that the core barrel 16 is guided both by itshead 18 and by reason of its mounting within the drill barrel shoe 14.This mounting of the core' bar-' rel will hold it in correct axialalignment relative to the drill barrel at all times.

One of the features of the present device is the delivery of fluid tothe cutting edges of the shoes to clean away the cuttings. This isaccomplished by provlding radial passage .ways 21 in the drillbarrelhead which extend inwardly from the exterior surface of the headto an interior chamber 22 extending inwardly from the lower end of thehead 10. The lower end of the chamber 22 is normally closed by a springpressed back pressure valve 23, which opens downwardly. This valve iscapable of admitting the fluid to the upper end of the bore of the-drillbar-" rel when the drill barrel is raised relative to the core barrel.When the former is loW- cred-relative to the core barrel, the valve 23prevents returnof the fluid through the head 10 and the fluid isconsequently forced downwardly through the passage between the barrelsto, a point intermediate the lower edges of the cutting shoes. Thisfluid washes away the cuttings. I In operation, if it is desired to takea core of a well, the device is connected to the drill stem as describedand run in the well: During therunning in, the core barrel will assumeits lowermost position but will remain.

connected to the drillbarrel due to the abutment of the shoulders 15 and19. Upon reaching bottom, the drill shoe will commence cutting and thelower end of the head 10 will pound on the upper end of the core barrelhead and force it over the core. As the drill shoe is operated by thepercussion -method, the drill barrel will be constantly reciprocatedrelative to the core barrel when in operation and at each stroke willsimultaneously cut around the core and drive the core barrel over thecore thus out.

At each upward stroke of the drill barrel relativeto the core barrel,water will pass through the radial passageways 21 and through the valve23 and thence into the chamber between the head 10 and core barrel head18. Upon the downward stroke of the drill barrel, the valve 23 willclose and the water or fluid will be expelled downwardly through thegrooves 20 in the head 18 into the passagewa between the barrels, andthence through t e vertical grooves in the bore of the drill shoe to apoint inter:

mediate the cutting edges ofthe shoes. This keeps the hole clean andpermits a clean cut sample of the formation encountered to be obtained.I

. Any liquid trapped in the 'core barrel may discharge through a checkvalve 24 and radial passageways 25 which lead to the space intermediatethe barrels.

As soon as a depth has been penetrated corresponding to the lengthofcore desired, the

entire device is removed from the well and the core is extractedby;unscrewing the core barrel shoe from the barrel. If necessary, theentire core barrel may be removed from the drill barrel. I

To hold the core in place, a loose split ring 27 is mounted interiorlyof the core barrel shoe at its lower end. This ring pinches or shavesofl the cores and at the same time prevents their removal from thebarrel.

From the foregoing it is manifest that I have provided a device capableof use in connection with the percussion system of drilling and whichmay be'efliciently employed to take cores or samples of the formationen-' countered at frequent intervals and'at a minimum of time andexpense.

While Ihave shown the preferred form of my'invention, it is to beunderstood that various changes in its construction may be made by thoseskilled in the art without departing from the spirit of the invention asdefined in the appended claims.

I claim:

1.' A device of the character described comprising a drill barrel havinga closed upper end, means at the upper end of the barrel by which it maybe connected with a tool for low- -ering it and operating it within awell, a core barrel mounted within the drill "barrel and free tor alimited amount of axial movement relative thereto, a drilling shoe atthe lower end of the drill barrel whereby vertical reciprocation of thedrill barrel at the bottom of a well will form a core, the upper end ofthe drill barrel being adapted to strike against the upper end of thecore barrel during the reciprocation of the drill barrel and therebydrive the core barrel over the core formed by the drill barrel, fluiddelivery means formed intermediate the barrels, and means'for deliveringfluid through said delivery means and discharge it intermediate thelower ends of the barrels. I

2. A device of'the character described comprising a drill barrel havinga closed upper end, means at the upper end of the barrel by which it maybe connected witha tool for low-v ering it and operating it within awell, a core barrel mounted within the drill barrel and free for alimited amount of axial movement relative thereto, a drilling shoe atthe lower end of the drill'barrel whereby vertical reciprocation of thedrill barrel at the bottom of a well will form a core, the upper end ofthe drill barrel being adapted to strike against the upper end of thecore barrel during the reciprocation of the drill barrel and therebydrive the core barrel over the core formed by the drill barrel, fluiddelivery means formed intermediate thebarrels, and means actuated by therelative reciprocation of the barrels to force fluid through saiddelivery means and discharge it intermediate the lower ends of thebarrels.

3. A device of the character described comprising a drill'barrel havinga closed upper end, means at the upper end-of the barrel by lowering itand operating it .wthin a well, a core barrel mounted within the drillbarrel and free fora limited amount of axial movement relative thereto,a drilling shoe at the lower end of the drill barrel whereby verticalfluid to be expelled through said passageway and discharged intermediatethe lower ends of said barrels.

4. A device of the character described comprising a drill barrel havinga closed upper end, means at the upper end of the barrel 1 by which itmay be connected with a tool for lowering itand operating it within awell, a core barrel mounted within the drill barrel and free for alimited amount of axial move ment relative thereto, a drilling shoe atthe lower end of the drill barrel whereby vertical reciprocation of thedrill barrel at the bottom of a well will form a core, the upper end ofthe drill barrel being adapted to strike against the upper end of thecore barrel during the reciprocation of the drill barrel and therebydrive the core barrel over the core formed by the drill barrel, afluid-passages way intermediate the barrels, a check valve for admittingfluid intermediate the upper ends of the barrels upon the upward strokeof the drill barrel, said check valve closing upon the downward strokeof the drill barrel causing said fluid to be expelled through saidpassageway and discharged intermediate the 'lower ends of said barrels,discharge ports formed in the upper end of-the core barrel,

a check valve controlling said ports whereby fluid trapped in the corebarrel may be discharged into said passageway intermediate the barrels.

5. A core drill including a core barrel having a closed upper end, meansat the upper end of the barrel by which itmay be connected with a toolfor lowering it' and operating it within a well, a core barrel mounted.

' within the drill barrel and free for a limited rmed by ering fluidthrough said delivery means and discharging it intermediate the lowerend of the barrels. which ,it may be connected with a toolv for 6. In apercussion type core drill, the combination of inner and outer corebarrels, means for delivering fluid through delivery meansformedintermediate the barrels and discharging the same intermediate the lowertion, 'means including longitudinally extensible and concentricallydisposed members for drawing fluid from the drilled hole and forlongitudinally collapsing said concent ic members to direct said fluidtoward the corecutting means.

8. A sample-taking device including concentrically disposed members, acore receiving barrel secured to one of said members,

core-cutting means secu ed to one of said members, means for eflectingrelative longitudinal movement of said concentrically disposed membersand for driving said core barrel to take a core, valve means carried bysaid concentrically disposed members for creating a suction within thesame when the drill, the commembers are moved longitudinally in onedirection for drawing a fluid from the hole drilled and for forcing thefluid downwardly toward the core-taking members as the concentricallydisposed members are moved longitudinally relative to each other in theopposed direction. I

9. In a percussion type core drill,.the combination of a core-receivingbarrelja second barrel mounted around the core-receivingbarrel, the twosaidbarrels being longitudinall 'expansible, means for driving the innerarrel into'the formation so that a core is received in the inner barrel,and for relatively reciprocating the said barrels to draw a liquid fromthe drilled hole into the outer of said barrels and to force the samefrom the outer of said barrels on the opposite strokes of the relativereciprocation of said barrels. I

' Signedat Los Angeles, California, this 27 T day of June, 1928. o g

REUBEN CfBAKER.

drill barrel at the bottom of the well will form a core, fluid deliverymeans formed intermediate the barrels, and means for deliv-

